The ESP Obstetric & Gynecological Sonography Quiz Cards by Anna Sandoval is a study guide in flashcard format focusing on the subject area of gynecology. Published in 2003, these quiz cards cover the topic of obstetric and gynecologic sonography. Written by Mometrix, the author of the publication, these flashcards are a valuable educational tool for those studying or working in the field of obstetrics and gynecology.